A590 vs Kickstart 1.3 questions

[countzero]

Recently I've managed to install a 1gb fujitsu drive into my A590. I'm using it with a 1.3 machine and 1.3.3 Workbench. I've some questions for this setup.

1- what is the maximum partition size I can use with the 1.3 roms/wb ?
2- I'm experiencing chip ram shortage. Games like hired guns just quit repoting insufficent chip memory. I've 2mb minimeg installed and 2mb on the a590, so is there a way I can use this as chip ram ?
3- The power connector for hd on the a590 has only three pins, 12v, 5v and one ground. Though modern harddrives need two ground lines. Should I make a connector which couples the ground line ? (feeding the same ground into both lines, is it dangerous ?) or would my hd be ok with a single ground line ? (currently I'm using it with the case open and standard pc psu with a standard connector.)

many thanks in advance

[countzero]

glitch wrote:

On a more technical note, you might be able to change the "Mask" inside of the HDToolBox program for that drive and its partitions to ensure that the drive uses fast RAM instead chip for it's data transfers.  As well, check to see how many buffers you have set for each partition - the usual is 30.

Does anyone here have settings that they can forward for this device?

Hmm, this looks like a good idea. is there a way I can see where my fast ram is mapped in the address space, and use a corresponding mask ?

[countzero]

It seems like my cheap gigatron minimax had an option to register some of its ram as chip-ram. Today I noticed a pin on the gary adapter which says "FAT" on it and I figured out I should join it somewhere on agnus but where ? after some research I found out that it should be wired to jumper 2 near the kickrom (actually this jumper is pin 19? of agnus). So now I have 1 mb chip ram. But still I have problems. if I put a partition > 50mb, the keychecksum fails somewhere and I lose the whole partition. Also I noticed some games fail because I'm trying to run them on a NTSC Amiga with OCS chipset, and they mess the partition while craching as well. The best working games are Monkey Island's and Colonization, both of which work with even 512k chip. Pirates also works well. I guess a wb1.3 setup is not very rewarding, more difficult to maintain than I assumed.